Preliminary Study on Wind Tunnel Test of Amphibious Aircraft Dropping Water

High speed, large water load, and drawing water repeatedly and quickly from the source of water are the advantages of firefighting using amphibious aircrafts, the effect of firefighting largely depends on the coverage level of the water dropped on the ground. Different firefighting aircrafts have different design characteristics that make the situations of water reaching the ground from different aircrafts obviously different. Through wind tunnel test, based on the design parameters of AG600 aircraft, the falling characteristics of water dropped from amphibious aircraft with different speed, height, and quantity were studied, and the distribution characteristics of dropped water on the ground were measured by ground water collecting devices. The results show that the higher speed and height of dropping water, the more obvious the aerodynamic influence on the dropping water is, the more significant the atomization is, and the less water mass fell on the ground.